How to transfer bottles of beer to jug?

I'm going to a campground that does not allow gl bottles. I was wondering if there was any way I could put the beer in the bottles into a plastic jug and keep it somewhat carbonated, it will only be for about 12 hours. I could sneak them in but would rather respect the rules and not risk losing all my beer. I drink micro brews and home brews and they don't come in cans. Any help is much appreciated.